On 10/15/2021 7:53 AM, Michael Tope wrote:
What about control cables coming down the tower? I just skimmed through
the first edition of Ward's grounding book. It recommends bonding the
coax shields to the tower, but doesn't say anything about control
cables.
Hi Mike,
Bonding coax top and bottom is done to protect the cable, to keep it at
the same potential as the tower, and I suspect it comes from practice in
the commercial world for hard line. I inherited a piece of 7/8-in line
from a de-commissioned AT&T Long Lines site that was carbonized from a
lightning hit.
GDTs are recommended at the shack entry bonding point to protect control
circuitry. I've not heard of them being used at the tower to protect
rotators and switch boxes, but it's certainly not a bad idea. If done,
it makes sense to do so close to those units.
73, Jim K9YC
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